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q in (-oo:+oo)
2*q^(1/3) = 2 // - 2
2*q^(1/3)-2 = 0
2*q^(1/3) = 2 // : 2
q^(1/3) = 1
q^(1/3) = 1 // ^ 3
q = 1
q = 1
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